TABLE 1.

Activities of phase I variants of Xenorhabdus and Photorhabdus species grown on NA plates containing 1% (vol/vol) Tween and NA plates containing 0.01% (wt/vol) lecithin after 2 days of incubation at 28°C

Nematode host	Bacterium		Activity witha:
	Taxon	Strain	Lecithin	Tweens 20, 40, and 60	Tween 80	Tween 85
Steinernema sp.	X. beddingii	Q58	+	+	+w	+
S. feltiae	X. bovienii	F5	+	−	−	+
S. affine	X. bovienii	F3	+	−	−	−
S. feltiae	X. bovienii	T228	+	−	−	−
S. intermedium	X. bovienii	Si	+	−	−	−
S. kraussei	X. bovienii	SK2	+	−	−	−
S. carpocapsae	X. nematophilus	F1	+	+	+	−
S. carpocapsae	X. nematophilus	A24	+	+	−	+
S. carpocapsae	X. nematophilus	AN6	+w	+	−	−
Steinernema sp.	Xenorhabdus sp.	M16	+	+w	+	+w
S. anomalae	Xenorhabdus sp.	Sav	+	+	−	+
S. puertoricense	Xenorhabdus sp.	PR6a	−	+	−	+w
S. rarum	Xenorhabdus sp.	K77	−	+	+	+
S. cubanum	Xenorhabdus sp.	Cub	−	+	+w	−
S. glaseri	X. poinarii	NC33	−	+	+w	−
S. glaseri	X. poinarii	G6	−	+	−	−
Heterorhabditis bacteriophora	P. luminescens	K80	−	+	+	+
Heterorhabditis bacteriophora	P. luminescens	Hb	−	+	+	+
Heterorhabditis bacteriophora	P. luminescens	C1	−	+	+	+
Heterorhabditis bacteriophora	P. luminescens	HP88	−	+	+	+
H. indica	P. luminescens	E20	−	+	+	+
H. indica	P. luminescens	HG21	−	+	+	+
H. indica	P. luminescens	IS5	+	+	+	+
H. indica	P. luminescens	Meg	+w	+	+	+
H. megidis	P. luminescens	HW79	−	+	+	+
H. megidis	P. luminescens	XLNach	−	+	+w	+
H. zealandica	P. luminescens	NZH3	−	+	+	+
Heterorhabditis sp.	P. luminescens	C8406	−	+	+	+
Heterorhabditis sp.	P. luminescens	K122	−	+	+	+
Heterorhabditis sp.	P. luminescens	ItH211	−	+	+	+
Heterorhabditis sp.	P. luminescens	Hm	−	+	+	+
Clinical strain	P. luminescens	43950	−	−	−	−

^aActivity as measured by the production of a white halo of precipitation surrounding each colony. +, strong production; −, no production; +^w, weak production.